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(6
JIS G 3106
2004(JISF)
JAPANESE
INDUSTRIAL
STANDARD
Translated and Published by Japanese Standards AssociationG 3106: 2004
Foreword
This translation has been made based on the original Japanese Industrial Standard revised by the Minister of Economy, Trade and Industry through deliberations at the Japanese Industrial Standards Committee, as the result of proposal for revision of Japanese Industrial Standard submitted
by The Japan Iron and Steel Federation (JISF) with the draft being
at-tached, based on the provision of Article 12 Clause 1 of the Industrial Standardization Law applicable to the case of revision by the provision of Article 14. Consequently JIS G 3106 : 1999 is replaced with this Stan-dard.
Attention is drawn to the possibility that some parts of this Standard may conflict with a patent right, application for a patent after opening
to the public, utility model right or application for registration of utility model after opening to the public which have technical properties. The
relevant Minister and the Japanese Industrial Standards Committee are not responsible for identifying the patent right, application for a
patent after opening to the public, utility model right or application for registration of utility model after opening to the public which have the
said technical properties.
@ J5A 2004
Date of Establishment: 1952-11-25 Date of Revision: 2004·03·20
Date of Public Notice in Official Gazette: 2004·03·22
Investigated by: Japanese Industrial Standards Committee
Standards Board
Technical Committee on Iron and Steel
JIS G 3106: 2004, First English edition published in 2004-06
Translated and published by: Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN
In the event of any doubts arising as to the contents, the original JIS is to be the final authority.
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or
utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
Printed in Japan
G 3106: 2004 Contents Page Introduction ... _...... 1 1 Scope ...... 1 2 Normative references ... 1
3 Grade and designation ... 1
4 Chemical composition ... 2
5 Carbon equivalent or chemical composition on sensitivity of welding crack... 3
5.1 Carbon equivalent or chemical composition on sensitivity of welding crack for SM570 ... 3
5.2 Carbon equivalent or chemical composition on sensitivity of welding crack for thermomechanically controlled steel plate ... 4
6 Mechanical property ...... 5
6.1 Yield point or proof stress, tensile strength and elongation ... 5
6.2 Charpy absorption energy ... 7
7 Shape, dimension, mass and the tolerance thereon... 7
8 Appearance ...... 7
9 Heat treatment and symbol... 7
9.1 Heat treatment ...... 7
9.2 Symbol of heat treatment ... 7
10 Tests... 8 10.1 Chemical analysis... 8 10.2 Mechanical test ... 8 11 Inspection... 10 11.1 Inspection ... 10 11.2 Reinspection... 10 12 Marking ...... 10 13 Report ... 11
G 3106: 2004
Annex 1 (normative) Sampling position of the test piece ... 13
Annex 2 (normative) Structural steels-Plates, wide flats, bars, section
and profiles ... 15 Annex A (normative) Position and orientation of test pieces ... 25
Annex B (normative) Energy values for impact test pieces of reduced
size ... 26 Annex C (informative) List of International Standards on tolerances for
steel products ... 27
Annex D (informative) Notes on weldability ... 28
Annex 3 (informative) Comparison table between JIS and corresponding
International Standard ... 29
(ii)
JAPANESE INDUSTRIAL STANDARD
<6
JIS G 3106: 2004Rolled steels for welded structure
Introduction This Standard is the Japanese Industrial Standard specified by making revisions on the text of the original Japanese Industrial Standard revised in 1999 such as the expansion of the scope of flats, and by specifying ISO 630 Structural steels-Plates, wide flats, bars, sections and profiles published in 1995 as annex 2 without modifying the technical contents.
1 Scope This Standard specifies the hot rolled steels (hereafter referred to as "steel products") to be used for bridges, ships, rolling stocks, petroleum storage tanks, con-tainers and other constructions that have superior weldability.
Remarks: In using this Standard, either its text or annex 2 shall be applied. The International Standard corresponding to this Standard is as follows.
In addition, symbols which denote the degree of correspondence in the contents between the relevant International Standard and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) ac-cording to ISOIlEC Guide 2l.
ISO 630 : 1995 Structural steels-Plates, wide {lats, bars, sections and
profiles (MOD)
2 Normative references The standards listed in attached table 1 contain provi-sions which, through reference in this Standard, constitute provisions of this Stan-dard. The most recent editions of the standards (including amendments) indicated below shall be applied.
3 Grade and designation The steel products shall be classified into 11 grades, and their designation shall be as given in table 1.
2
G 3106: 2004
Table 1 Designation of grade
Designation of grade Applicable thickness mm
SM400A Steel plate, steel strip in coil, section and flat 200 or under SM400B
SM400C Steel plate, steel strip in coil and section 100 or under
Flat 50 or under
SM490A Steel plate, steel strip in coil, section and flat 200 or under SM490B
SM490C Steel plate, steel strip in coil and section 100 or under
Flat 50 or under
SM490YA Steel plate, steel strip in coil, section and flat 100 or under SM490YB
SM520B Steel plate, steel strip in coil, section and flat 100 or under SM520C Steel plate. steel strip in coil and section 100 or under
Flat 40 or under
SM570 Steel plate, steel strip in coil and section 100 or under
Flat 40 or under
Remarks 1 The steel plate which is until 150 mm in thickness of SM520B, SM520C and SM570 may be produced in accordance with agree-ment between the purchaser and supplier.
2 Flats up to 75 mm thick for SM400C and SM490C and up to 50 mm thick for SM520C may be produced in accordance with the agreement between the purchaser and supplier.
4 Chemical composition The steel products shall be tested in accordance with
10.1 and the ladle analysis value shall be in accordance with table 2.
Table 2 Chemical composition
Symbol of C S;
grade
SM400A 50 mm or under in thickness 0.23 max.
-Over 50 mm up to and incl. 200 mm in thickness 0.25 max.
SM400B 50 mm or under in thickness 0.20 max. 0.35
max. Over 50 mm up to and incl. 200 mID in thickness 0.22 max.
SM400C 100 mm or under in thickness 0.18 max. 0.35
max.
SM490A 50 mm or under in thickness 0.20 max. 0.55
max. Over 50 mm up to and incl. 200 rom in thickness 0.22 max.
SM490B 50 rom or under in thickness 0.18 max. 0.55
max. Over 50 mm up to and incl. 200 mm in thickness 0.20 max.
SM490C 100 mm or under in thickness 0.18 max. 0.55
max. SM490YA 100 mm or under in thickness 0.20 max. 0.55 max. SM490YB
SM520B 100 mm or under in thickness 0.20 max. 0.55
max. SM520C
SM570 100 mm or under in thickness 0.18 max. 0.55 max.
G 3106: 2004
Unit: %
Mn P S
2.5 xC 0.035 0.035 min.(I) max. max.
0.60 to 0.035 0.035 1.40 max. max.
1.40 0.035 0.035 max. max. max. 1.60 0.035 0.035 max. max. max.
1.60 0.035 0.035 max. max. max.
1.60 0.035 0.035 max. max. max. 1.60 0.035 0.035 max. max. max.
1.60 0.035 0.035 max. max. max.
1.60 0.035 0.035 max. max. max. Note (1) The value of carbon shall be applied the values of the actual ladle analysis.
Remarks 1 Alloying elements other than those given in table 2 may be added as necessary. 2 The chemical composition of the steel plate of which thickness is over 100 mm up to and including 150 mm in thickness of SM520B, SM520C and SM570 shall be in accordance with the agreement between the purchaser and the supplier.
5 Carbon equivalent or chemical composition on sensitivity of welding crack
5.1 Carbon equivalent or chemical composition on sensitivity of welding
crack for SM570 The carbon equivalent or chemical composition on sensitivity of
welding crack for SM570 shall be as follows:
Further, the carbon equivalent shall apply to quench-hardened and tempered steel
products.
a) The carbon equivalent shall be calculated from the following formula by using the ladle analysis values of 10.1 and shall be in accordance with table 3.
Carbon equivalent (%) =
C+ Mn + Si + Ni + Cr + Mo +~ ... (1)
4
G 3106: 2004
Table 3 Carbon equivalent
Thickness of steel product mm 50 max. Over 50 up to and incl. 100 Over 100
Carbon equivalent % 0.44 max. 0.47 max. As agreed upon between
the purchaser and supplier.
b) Chemical composition on sensitivity of welding crack may be applied instead of
carbon equivalent subject to the agreement between the purchaser and supplier.
In this case, the chemical composition on sensitivity of welding crack shall be calculated from the following formula by using the ladle analysis value of 10.1 and shall be in accordance with table 4.
Chemical composition on sensitivity of welding crack (%) = Si Mn Cu Ni Cr Mo V
C + - + - - + - - + - + - + - - + - + 5 B ... (2)
30 20 20 60 20 15 10
Table 4 Chemical composition on sensitivity of welding crack Thickness of steel product mm 50 max. Over 50 up to and incl. 100 Over 100
Chemical composition on sensi- 0.28 max. 0.30 max. As agreed upon between tivity of welding % the purchaser and supplier.
5.2 Carbon equivalent or chemical composition on sensitivity of welding crack for thermomechanically controlled steel plate The carbon equivalent
of the steel plate which is thermomechanically controlled processed under the agreement
between the purchaser and supplier and the chemical composition on sensitivity of
welding crack applied as substitute for the carbon equivalent under the agreement
between the purchaser and supplier shall be as follows:
a) The carbon equivalent The carbon equivalent shall be calculated from the
formula (1) of 5.1 by using the ladle analysis value of 10.1 and shall be in ac-cordance with table 5.
Table 5 The carbon equivalent
Unit· % Designation of grade SM490A SM490YA SM520B SM520C
SM490B SM490YB SM490C
Applicable 50 mm or under 0.38 max. 0040 max.
thickness
Over 50 mm up to and incl. lOOmm 0040 max. 0.42 max.
Remarks: The carbon equivalent of the steel plate over 100 mm in applied thickness shall be in accordance with the agreement between the purchaser and the supplier.
b) Weld cracking susceptibility of material Weld cracking susceptibility of
material shall be calculated from the formula (2) of 5.1 by using the ladle analysis value of 10.1 and shall be in accordance with table 6.
G 3106: 2004
Table 6 The weld cracking susceptibility of material
Unit· %
Designation of grade SM490A SM490YA SM520B SM520C
SM490B SM490YB SM490C
Applicable 50 mm or under 0.24 max. 0.26 max.
thickness
Over 50 mm up to and inel. lOOmm 0.26 max. 0.27 max.
Remarks: The weld cracking susceptibility of material of the steel plate over 100 mm
in applied thickness shall be in accordance with the agreement between the purchaser and the supplier.
6 Mechanical property
6.1 Yield point or proof stress, tensile strength and elongation The steel
products shall be tested in accordance with 10.2 and the yield point or proof stress, tensile strength and elongation shall be in accordance with table 7.
~
"
t;j
"
~"
~
~
Table 7 Yield point or proof stress tensile strength and elongation
Designation Yield point or proof stress Tensile strength Elongation
of grade N/mm2 N/mm2
Thickness of steel product(2) mm Thickness of steel Thickness of steel Test piece %
product
e)
mm product(2)16 or Over 16 Over 40 Over 75 Over 100 Over 160 100 or Over 100
under up to and up to and up to and up to and up to and under up to and mm inel. 40 incl. 75 incl. 100 inel. 160 incl. 200 inel. 200
SM400A 245 235 215 215 205 195 400 to 400 to 5 or under No.5 23 min.
SM400B min. min. min. min. min. min. 610 510 Over 5 up to and incl. 16 No.lA 18
SM400C - - Over 16 up to and incl. 50 No.lA 22
Over 40 NO.4 24
SM490A 325 315 295 295 285 275 490 to 490 to 5 or under NO.5 22
SM490B min. min. min. min. min. min. 610 610 Over 5 up to and incl. 16 No.lA 17
SM490C - - Over 16 up to and incl. 50 No.IA 21
Over 40 No.4 23
SM490YA 365 355 335 325 - - 490 to - 5 or under No.5 19
SM490YB min. min. min. min. 610 Over 5 up to and incl. 16 No.IA 15
Over 16 up to and incl. 50 No.IA 19
Over 40 NO.4 21
SM520B 365 355 335 325 - - 520 to - 5 or under No.5 19
SM520C min. min. min. min. 640 Over 5 up to and incl. 16 No.lA 15
Over 16 up to and incl. 50 No.lA 19
Over 40 No.4 21
SM570 460 450 430 420 -
-
570 to - 16 or under No.5 19min. min. min. min. 720 Over 16 No.5 26
Over 20 No.4 20
Note (2) For sections, the term ~thickness of steel product~ means the thickness at the position where the test piece is taken as shown in annex 1 figure 1. Remarks 1 For the elongation of No.4 test piece of the steel products over 100 mm in thickness, 1 % is subtracted from the value of elongation given in
table 7 per each increase of 25 mm in thickness or its fraction. However, the limit to be subtracted shall be 3 %.
2 The yield point or proof stress, tensile strength and elongation oCthe steel plate of over 100 mm up to and including 150 mm in thickness of SM520B, SM520C and SM570 shall be in accordance with the agreement between the purchaser and the supplier.
Q'" CO ~
a\
g
...
G3106: 2004
6.2 Charpy absorption energy The steel products over 12 mm in thickness shallbe tested in accordance with 10.2 and the Charpy absorption energy shall be as given in table 8. The Charpy absorption energy in this case shall be expressed by the average
of measured values of three test pieces and shall be judged by 9.6 of JIS G 0404. Table 8 Cbarpy absorption energy
Designation of grade Test temperature Charpy absorption energy Test piece
'C J
SM400B 0 27 min. V -notch test piece in rolling direction SM400C 0 47 min. SM490B 0 27 min. SM490C 0 47 min. SM490YB 0 27 min. SM520B 0 27 min. SM520C 0 47 min. SM57Q -5 47 min.
7 Shape, dimension, mass and the tolerance thereon The shape, dimension, and mass of the steel products and the tolerance shall be in accordance with the following standards;
JIS G 3192, JIS G 3193, JIS G 3194
In this case, the width tolerances for the steel plate and cut-edged coil as well as
the length tolerances for the steel plate shall be in accordance with the tolerance A in JIS G 3193 unless particularly specified.
8 Appearance The appearance of the steel products shall be in accordance with
clause 9 in JIS G 3192, clause 6 in JIS G 3193 or clause 8 in JIS G 3194.
Further, the repair by welding of the steel plate of SM570 shall be previously agreed between the purchaser and the supplier.
9 Heat treatment and symbol
9.1 Heat treatment The steel products may be subjected to normalizing, quench-hardening and tempering, or tempering, as necessary. For all designations of grade,
heat treatment such as thermomechanical control process may be applied under the agreement between the purchaser and the supplier.
9.2 Symbol of heat treatment When the steel products have been subjected to heat treatment, the symbol of heat treatment shall be as follows:
Further, in appending the symbol of heat treatment according to the following manner, the symbol shall additionally be written to the end of the symbol of grade given in table 1.
8
G 3106: 2004
a) In the case where normalizing is applied for the steel products by agreement between the purchaser and manufacturer: N
b) In the case where tempering is applied for the steel products by agreement be-tween the purchaser and manufacturer: T
c) In the case where quench-hardening and tempering is applied for the steel
products; Q
d) In the case where thermomechanical control is applied for the steel products: TMC
e) In the case where appropriate heat treatment is applied for the steel products: By agreement
Example of symbols: SM 490 CN, SM 570 TMC 10 Tests
10.1 Chemical analysis Chemical analysis shall be as follows.
10.1.1 Generals requirements for chemical tests The chemical composition of the steel products shall be determined by ladle analysis, and general requirements for chemical analysis and the sampling method of specimen for analysis shall be as
specified in clause 8 in JIS G 0404.
10.1.2 Analytical method The method for chemical analysis shall be in accor-dance with anyone of the following standards:
JIS G 1211, JIS G 1212, JIS G 1213, JIS G 1214, JIS G 1215, JIS G 1216, JIS G 1217, JIS G 1218, JIS G 1219, JIS G 1221, JIS G 1227, JIS G 1238, JIS G 1253, JIS G 1256, JIS G 1257, JIS G 1258
10.2 Mechanical test
10.2.1 Test in general General requirements for mechanical testing shall be as
specified in clause 9 of JIS G 0404. In this respect, the sampling method of speci-men shall conform to class A, and number of test pieces and sampling positions shall
be as follows:
a) Number of tensile test pieces The number of tensile test pieces shall be as follows:
1) Steel plate and flat A test lot shall consist of the steel products, from one heat where the maximum thickness is within twice the minimum thick-ness, and one tensile test piece shall be taken therefrom. When the mass of one test lot, however, exceeds 50 t, two tensile test pieces shall be taken. With this respect, if a single steel plate exceeds 50 t, one test piece shall
be taken from the said plate.
2) Steel strip in coil and cut-to-Iengths A test lot shall consist of the steel
products, from one heat, rolled to the same thickness, and one tensile test piece shall be taken therefrom. When the mass of one test lot, however, exceeds 50 t, two tensile test pieces shall be taken.
G 3106: 2004
3) Steel section A test lot shall consist of the steel products, from one heat, rolled to the same sectional profile group where the maximum thickness is within twice the minimum thickness, and one tensile test piece shall be taken therefrom. When the mass of ODe test lot, however, exceeds 50 t,
two tensile test pieces shall be taken.
4) Number of test pieces for heat treated steel products The number
of test pieces for the heat treated steel products, from the same heat, rolled to the same sectional profile group, subjected to heat treatment under the same treatment conditions, shall be determined in accordance with 1), 2) or 3) in this item.
b) Number of impact test pieces For the steel products that have not been heat
treated, one specimen shall be taken from the maximum thickness product of a test lot, from one heat, rolled to the same sectional profile group. For the heat treated steel products, one specimen shall be taken from the maximum thickness product of a test lot, from one heat, rolled to the same sectional profile group, subjected to heat treatment under the same treatment conditions. Three test pieces shall be taken from each specimen parallel to the rolling direction.
c) Sampling position of the tensile test piece Sampling position of the ten-sile test piece shall be in accordance with JIS G 0416. However, annex 1 may be applied. Test pieces of steel strip in coil shall be sampled from the position adjacent to the material section to be evaluated.
d) Sampling position of the impact test piece Sampling position of the im-pact test piece shall be in accordance with JIS G 0416. For the thickness of 40 mm or less, annex A figure A.11 a) of JIS G 0416 shall apply. and for the thickness of over 40 mm, annex A figure A.11 b) of JIS G 0416 shall apply.
Annex 1 may be applied.
Test pieces of steel strip in coil shall be sampled from the position adjacent to the material section to be evaluated.
10.2.2 Test piece The tensile test piece and impact test piece shall be as follows: a) No. lA, No.4 or No.5 test piece specified in JIS Z 2201
b) The V-notch test piece specified in JIS Z 2202. In this case, the longitudinal direction of the notch of the test piece shall be perpendicular to the rolled sur-face.
10.2.3 Test method The methods for tensile test and impact test shall be as fol-lows:
a) JIS Z 2241 b) JIS Z 2242
10.2.4 Tensile test in the case where tensile test piece having specified di-mensions can not be taken In the case where it is infeasible to secure the test piece having specified dimensions, matters on execution of tensile testing, test re-sult values or the like shall be agreed upon between the purchaser and supplier.
10
G 3106: 2004
10.2.5 Omission of tensile test and impact test of steel coil The tensile test and impact test of the steel coil may be omitted when approved by the purchaser.
11 Inspection
11.1 Inspection The inspection shall be carried out as follows:
a) General requirements for inspection shall be as specified in JIS G 0404. b) The chemical composition shall conform to the requirements specified in clause 4.
c) The carbon equivalent or chemical composition on sensitivity of welding crack shall conform to the requirements specified in clause 5.
d) The mechanical properties shall conform to the requirements specified in clause 6. e) The shape, dimensions and mass shall conform to the requirements specified in
clause 7.
o
The appearance shall conform to the requirements specified in clause 8.g) The purchaser may specify the ultrasonic testing specified in JIS G 0801 or JIS G 0901 or the like in addition to the inspection items given in a) to O. In this case, the test method, acceptance criteria, etc. shall be agreed previously between the purchaser and manufacturer.
11.2 Reinspection The reinspection shall be as follows:
a) The steel products which have not passed the tensile test may be retested in accordance with 9.8 in JIS G 0404 and then whether it is accepted or not may be determined.
b) The steel products which have failed in the impact test specified in 9.6 of JIS G 0404 may be retested in accordance with 9.8 of JIS G 004 and determined to be acceptable or not.
c) The steel products which have not passed the mechanical test, .may be again subjected to the mechanical test after heat treatment or reheat treatment. Then,
whether it is accepted or not may be determined.
12 Marking The steel products which have passed the inspection shall be marked on each piece or each bundle with the following items by a suitable method. How-ever, a part of the items may be omitted subject to the agreement between the pur
-chaser and supplier.
a) Symbol of grade (including the symbol which stands for symbol of heat treat-ment specified in 9.2)
b) Heat number or inspection number c) Dimensions
d) Quantity or mass of each bundle (for steel plate and coil) e) Manufacturer's name or identifying brand
G 3106: 2004
13 Report The test report shall be in accordance with clause 13 in JIS G 0404. In case required, the manufacturer shall submit the symbol 2.3 or 3.1.B specified in
table 1 of JIS G 0415 to the purchaser.
Where the provision of remarks 1 of table 2 is applied, the content of alloying elements added shall be noted in the test report.
12
G 3106: 2004
Attached Table 1 Normative references
JIB G 0404 Steel and steel products-General technical delivery requirements JIS G 0415 Steel and steel products-Inspection documents
JIS G 0416 Steel and steel products-Location and preparation of samples and test pieces for mechanical testing
JIS G 0801 Ultrasonic examination of steel plates for pressure vessels
JIS G 0901 Classification of structural rolled steel plate and wide flat for build· ing by ultrasonic test
JIS G 1211 Iron and steel-Methods for determination of carbon content JIS G 1212 Iron and steel-Methods for determination of silicon content JIS G 1213 Iron and steel-Methods for determination of manganese content JIS G 1214 Iron and steel-Methods for determination of phosphorus content JIS G 1215 Iron and steel-Methods for determination of sulfur content JIB G 1216 Iron and steel-Methods for determination of nickel content JIB G 1217 Methods for determination of chromium in iron and steel JIB G 1218 Iron and steel-Methods for determination of molybdenum
con-tent
JIB G 1219 Iron and steel-Methods for determination of copper content JIS G 1221 Iron and steel-Methods for determination of vanadium content JIB G 1227 Iron and steel-Methods for determination of boron content JIB G 1238 Steel and iron-Determination of chromium content-Potentiometric
or visual titration method
JIB G 1253 Iron and steel-Method for spark discharge atomic emission spec-trometric analysis
JIB
G 1256
Iron and steel-Method for X-ray fluorescence spectrometric analysis JIB G 1257 Iron and steel-Methods for atomic absorption spectrometricanaly-szs
JIB G 1258 Iron and steel-Methods for inductively coupled plasma atomic emission spectrometry
JIS G 3192 Dimensions, mass and permissible variations of hot rolled steel sections
JIg G 3193 Dimensions, mass and permissible variations of hot rolled steel plates, sheets and strip
JIg G 3194 Dimensions, mass and permissible variations of hot rolled flat steel JIg Z 2201 Test pieces for tensile test for metallic materials
JIg Z 2202 Test pieces for impact test for metallic materials JIg Z 2241 Method of tensile test for metallic materials JIg Z 2242 Method of impact test for metallic materials
Annex 1 (normative)
Sampling position of the test piece
G 3106: 2004
1 Scope This annex specifies the sampling position of the test piece for tensile
tests and impact tests.
2 Applicable date This annex applies until Dec. 31, 2008.
3 Sampling position of the test piece for tensile tests Sampling position of the test piece for tensile tests shall be as follows:
a) Steel plate, steel strip in coil and flat The centre of the test piece shall be
at a quarter-width position from a side edge, and further in the case of No.4
test piece, it shall be at a quarter-thickness position from a surface as well as a quarter-width position from a side edge. When it is infeasible to allow the centre of the test piece to be at a quarter-width position from a side edge or at a quarter·thickness position from a surface, however, the sampling should be performed as close to the aforementioned position as possible.
b) Steel section The sampling position shall be as shown in annex 1 figure 1.
When it is infeasible to take a specimen as shown in annex 1 figure 1, the sam·
pIing position should be as close to the aforementioned position as possible. In the case of the steel H section from which a specimen is unable to take in the
same manner as shown in annex 1 figure 1, the sampling position for the I section should be applied mutatis mutandis. For other steel sections, it should be agreed between the purchaser and the supplier.
4 Sampling position of the test piece for impact tests Sampling position of the test piece for impact tests shall as follows:
a) Steel plate, steel strip in coil and flat The centre of the test piece shall be
at a quarter·thickness position from a surface, and it shall be at a quarter·width position from a side edge as well as a quarter· thickness position from a sur· face. When it is infeasible to allow the centre of the test piece to be at a quar·
ter-thickness position from a surface and at a quarter-width position from a side edge, however, the sampling should be performed as close to the aforementioned
position as possible.
b) Steel section The centre of the test piece shall be at a quarter-thickness
po-sition from a surface (see annex 1 figure 1). When it is infeasible to allow the centre of the test piece to be at a quarter-thickness position from a surface,
however, the sampling should be performed as close to the aforementioned
po-sition as possible. In the case of the steel H section from which a specimen is unable to take in the same manner as shown in annex 1 figure 1, the sampling
position for the I section should be applied mutatis mutandis. For other steel sections, it should be agreed between the purchaser and the supplier.
14 G 3106: 2004
I
t
a
l
B Equal angle Bulb flat Unequal angle ChannelAngle with unequal leg and unequal thickness
I-section H·section
Annex 1 Figure 1 Sampling position of the test piece for
tensile tests and bend tests for steel section
Annex 2 (normative)
G 3106: 2004
Structural steels-Plates, wide flats, bars, section and profiles
Introduction This annex is the Japanese Industrial Standard prepared based on
ISO 630 Structural steels-Plates, wide flats, bars, sections and profiles published in 1995 as the second edition without modifying its technical content.
In this annex, the portions underlined with dot line are the matters added in the
original International Standard.
Furthermore, the following annexes are contained in this annexes.
Annex A (normative) Position and Orientation of test pieces
Annex B (normative) Energy Values for impact test pieces of reduced size
Annex C (informative) List of International Standards on tolerances for steel products
Annex D (informative) Notes on weldability
1 Scope This annex specifies qualities for the general purpose structural steels listed
in table 1 of the body. This annex applies to steel plates with thicknesses of 3 mm or over, wide strip in coils with widths 600 mm or over, and more than 6 mm in
thick-ness, wide flats, bars and hot-refold sections generally used in the as-delivered condi-tion and normally intended for bolted, riveted or welded structures(l).
It does not include the following steels, certain of which are covered by other
In-ternational Standards:
steels for boilers and pressure vessels (ISO 9328-2); plates of drawing quality (ISO 3573 and ISO 3574);
heat-treated (quenched and tempered) structural steels; bars for the reinforcement of concrete;
strip of width 600 mm or over and thickness not exceeding 6 mm (ISO 4955).
Note <I) For precautions to be taken when welding, the guide for the welding and weldability of C-Mn and C-Mn micro-anoy steels published by
Sub-com-mission IX-G of the International Welding Institute (document ISS/I IWI
843-87), together with the notes given in annex D should be referred to. In particular, for the grade E 355, it should be noted that ISO 4950-2 specifies an equivalent grade with better welding characteristics.
2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this Standard. At the time of publi-cation, the editions indicated were valid. All standards are subject to revision, and
parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
Members of lEe and ISO maintain registers of currently valid International Stan-dards.
16
G 3106: 2004
ISO 148 : 1983 Steel- Charpy impact test (V-notch)
ISO 377-1 : 1989 Selection and preparation of sampLes and test pieces of wrought steels- Part 1 : Samples and test pieces for mechanical test This Standard has been revised as ISO 377 : 1997.
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~~.9.~.~~~.§~~l!L~!!-.t! .. ~.~~~!.p.!.~4.rf.c:.~~=!:.c!.~l!:~~~~_.~.'!:4..P.r:!!:p.~!.f!:.~~.C?'!: C!f.~_c!:~p?!!:~_.c!:1!:4..!~.~.~.p.~!!:~~~.If!!. .. '!':!!:~~.l!:~~~l!:!..t!!:~~~~Q..~.f:' .. !~~.~~~~~.~.~~.~:l?:the said standard.
ISO 377-2 : 1989 Selection and preparation of samples and test pieces of wrought steels-Part 2: Samples for the determination of the chemical composition
This Standard has been revised as ISO 14284: 1996.
Information: JIS G 0417 Steel and iron-Sampling and preparation of samples
···
·
··
·
·
·
··
·
·
·
····
·
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·f~E.f~i·.¢.~·~~.~~.~~.~~.~9.·~·.·~{~.~~;;j.~·~·~l·.~.~~P..9.~·t.~Ti!.~·)~·.-.~·~.~~.~·~.~.~~.·.~H~ISO 404 : 1992
the said standard.
Steel and steel products-General technical delivery require -ments
ISO 2566·1 : 1984 Steel-Conversion of elongation values-Part 1 : Carbon and low alloy steels
ISO 3573 : 1986 Hot·rolled carbon steel sheet of commercial and drawing qualities
ISO 3574 : 1986 Cold-reduced carbon steel sheet of commercial and drawing ISO 4948-1 : 1982 Steels-Classification-Part 1 : Classification of steels into un
-alloyed and alloy steels based on chemical composition ISO 4950-2 : 1995 High yield strength flat steel products- Part 2 : Products
sup-plied in the normalized or controlled rolled condition ISO 4955 : 1994 Heat-resisting steels and alloys
ISO 4995 : 1993 Hot-rolled steel sheet of structural quality ISO 6892 : 1984 Metallic materials- Tensile testing
ISO 6929 : 1987 Steel products-Definitions and classification
ISO 7788 : 1985 Steel-Surface finish of hot-rolled plates and wide flats-De-livery requirements
ISO 9328-2 : 1991 Steel plates and strips for pressure purposes- Technical delivery conditions-Part 2 : Unalloyed and low-alloyed steels with speci -fied room temperature and elevated temperature properties ISO 10474: 1991 Steel and steel products-Inspection documents
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9~~§..
§~~~!..r:!.T}:~.!!!.~~.?p!.~.c!:~.c:.~~=!~.~R.~~~.~'?~.4.~~~.'!!:~!!:~.~ .. ~.~ identical with the said standard.3 Definitions Definitions of the terms "plate", "wide strip", "narrow strip" and
"wide flat" are given in ISO 6929.
4 General requirements
G 3106: 2004
4.1 Steelmaking process Unless otherwise agreed at the time of enquiry and order, the steel marking process is left to the discretion of the manufacturer: except for quality 0, the purchaser shall be informed of the process at the time of delivery. 4.2 Delivery condition
4.2.1 The products are generally delivered in the as-rolled condition. Other deliv-ery conditions may form the subject of agreement when ordering.
4.2.2 Flat products of quality D may be ordered in two categories.
Quality Dl: It shall be delivered in the normalized or equivalent condition. The mechanical properties given in annex 2 table 3 are applicable in both the deliv-ered condition and after normalizing by separate heat treatment after delivery. Quality D2: The mechanical properties given in annex 2 table 3 are only appli-cable in the delivery condition. The delivery condition is left to the discretion of the manufacturer.
4.3 Surface appearance-Defects
4.3.1 Surface appearance The products shall have a smooth surface corresponding to the rolling method used; they shall have to defects that are prejudicial to their subsequent processing or appropriate use.
4.3.2 Flat products The requirements of ISO 7788 shall apply. 4.3.3 Long products
a) Minor defects may be removed by the manufacturer with grinding, provided that the thickness stays within the lower tolerance limits specified in the appropri-ate International Standards (refer to list in annex C) or, in the absence of In-ternational Standards, is not reduced locally by more than 6 % in relation to its nominal value.
b) Unless otherwise specified in the order, imperfections that are greater in depth than the limit specified in a) may be removed and deposited by welding subject to the following conditions.
The reduction of thickness of the material, resulting from removal of imper-fections prior to welding, shall not exceed 2 % of the nominal thickness at the location of the imperfection.
All welding shall be performed by competent welders, using welding elec-trodes appropriate for the grade being repaired and following welding pro
-cedures approved by the purchaser. 5 Characteristics of grades and qualities
5.1 Chemical composition The steels specified are carbon steels in accordance with ISO 4948-1.
18
G 3106: 2004
5.1.1 Ladle analysis The maximum values of the composition limits for ladle analy· sis are given in annex 2 table 1.
5.1.2 Product analysis Annex 2 table 2 gives the permitted deviations on analy-sis relative to the values for ladle analysis which are given in annex 2 table 1. 5.2 Mechanical properties The steels, in the delivery condition defined in 4.2: shall comply with the mechanical properties specified in annex 2 table 3 when these are determined on test pieces prepared in accordance with 6.4.
For products over 200 mm in thickness, the mechanical properties shall be the subject of an agreement between the purchaser and the supplier.
6 Inspection and testing
6.1 General Rolled products covered by this annex may be the subject of an in-spection and testing in accordance with the conditions specified in 8.3 of ISO 404 : 1992, relating to the mechanical properties and chemical analysis of the product. However, grade E 185 is only supplied with non-specific inspection and testing. Veri-fication of chemical composition on the product and of the impact energy values at ambient temperature is only carried out by agreement at the time of enquiry and order. If an inspection and testing has been specified in the order, it shall be car-ried out in accordance with 6.2 to 6.5, unless otherwise agreed when ordering. 6.2 Test unit Batching shall be by cast.
6.2.1 The test unit shall be 50 t or its fraction taken from one cast.
6.2.2 For each test unit and thickness range, as defined in annex 2 table 3, the se-ries of the following tests shall be carried out.
one tensile test [or additional test, in accordance with 6.2.4 a) for products of thickness 16 mm or under};
one set of three impact tests at 0 °C for quality C and one set of three test at -20 °C for quality D:
If specified on the order, one product analysis;
one set of three impact tests at +20 °C for quality B.
6.2.3 The purchaser or his representative may witness the selection of the product sample from which the samples shall be taken for the verification of properties (re-fer to ISO 404).
6.2.4 Unless otherwise agreed by the purchaser, the procedure shall be as follows. a) Tensile test One test sample shall be taken for each thickness range given in annex 2 table 3, with a supplementary requirement that, for the thickness 16 rom or under, the thickness of products shall be such that the maximum thickness is not greater than twice the minimum thickness.
Grade E 185 (Fe 310) E 235 (Fe 360) E 275 (Fe 430) E 355 (Fe 510) G 3106: 2004
Annex 2 Table 1 Chemical composition (ladle analysis)
Quality Thickness Method of C Si Mn P S
,
deoxidation (l) % % % % %mm max. max. max. max. max.
0
A - 0.22 - - 0.050 0.050
B 16 or under - 0.17 0.40 1.40 0.045 0.045 Over 16 up to and incl. 25
-
0.20 0.40 1.40 0.045 0.04540 or under NE 0.17 0.40 1.40 0.045 0.045 Over 40 NE 0.20 0.40 1.40 0.045 0.045 C NE 0.17 DAD 1.40 0.040 0.040 D GF 0.17 0.40 lAO 0.035 0.035 A - 0.24
-
- 0.050 0.050 B 40 or under NE 0.21 0.40 1.50 0.045 0.045 Over 40 NE 0.22 0.40 1.50 0.045 0.045 C NE 0.20 0.40 1.50 0.040 0.040 D GF 0.20 0.40 1.50 0.035 0.035 C 30 or under NE 0.20 0.55 1.60 0.040 0.040 Over 30 NE 0.22 0.55 1.60 0.040 0.040 D 30 or under GF 0.20 0.55 l.60 0.035 0.035 Over 30 GF 0.22 0.55 1.60 0.035 0.035 Note (2) NE = Non·rimmingGF = These steels shall have a sufficiently high content of elements to produce a fine~ grained structure (for example total AI 0.02 % or over).
Information: The letters shown in ( ) are the former designation of the steel products.
Annex 2 Table 2 Permissible deviation for the product
analysis relative to the specified ladle
analysis [refer to 6.4.3 a)]
Element Specified limits % Permissible deviation % C 0.24 or under +0.03
Si 0.55 or under +0.05
Mn 1.60 or under +0.10
p 0.050 or under +0.010
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Annex 2 Table 3 Mechanical properties
Grade Quality Yield point R.u min. N/mm2 Tensile Elongation A min. (Lo = 5.65.[So) %
Thickness
16 or Over 16 Over 40 Over 63 under up to and up to and up to and
incl. 40 inel. 63 E ta5(e)
•
(85 175 -(Fe 310).
....
.
E 235 A 235 225 215 (Fe 360) B(6) 235 225 -BNE 235 225 215 C 235 225 215 0 235 225 215 E 275 A 275 255 255 (Fe 430) B 275 255 255 C 275 255 255 0 275 255 255 E 355 C 355 345 335 (Fe 510) 0 355 345 335Remarks: Rell = upper yield stress
Rm = tensile strength incl. 80 -215 -215 215 215 245 245 245 245 325 325 mm Over 80 up to and incl. 100
-215 -215 215 2<5 235 235 235 235 315 315A = percentage elongation after fracture %
strength
Thickness mm
Rm(3)
Over 100 Over 150 N/mm2 16 or Over 40 Over 63 Over 100 up to and up to and under up to Hnd up to and up to and
incl. 150 incl. 200 incl. 63 incl. 100 incl. 150
(.) (.) (.) - - 300 to 540 18 - - -195 185 340 to 470 26 25 24 22 - - 340 to 470 26 - - -195 185 340 to 470 26 25 24 22 195 185 340 to 470 26 25 24 22 195 185 340 to 470 26 25 24 22 (') 225 215 41000540 22 21 2. 18 225 2<5 41000540 22 21 2. 18 225 215 410 to 540 22 21 2. 18 225 215 410 to 540 22 21 2. 18 (') 295 285 490 to 640 22 21 2. 18 295 285 490 to 640 22 21 2. 18 (')
Lo = gauge length on test piece
So = original cross-sectional area of gauge length
1 N/mm2=MPa
Notes (3) For the tensile strength of wide strip only the minimum value of the range is applicable.
Over 150 up to and incl. 200 (.) -21 -21 21 21 17 17 17 17 17 17 Impact test (V-notch), KV Test tern- Energy perature min.(~) 'C J - --
--
-+2. 27
•
27 -2. 27 - -+2. 27•
27 -2. 27•
27 -2. 27(') For transverse test pieces (plates and wide flats of width 600 mm or over), these values are reduced by two points.
(5) Average of three tests; no individual result shall be less than 70 % of the specified minimum average value.
(6) This quality B is only delivered in thickness less than 25 mm.
(1) For over 100 mm in thickness, the lower limit of the range may be reduced 20 N/mmz.
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G 3106: 2004
b) Impact test One test sample shall be taken for each thickness range speci-fied in annex 2 table 3. For flat products of quality D, if agreed at the time of enquiry and order, a test sample shall be taken from each rolled product (par-ent plate or coil).
6.3 Position and orientation of test sample (refer to ~~g
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~.~.~~) 6.3.1 Plates, wide steel strip in coil and wide flats of width 600 mm or over The test samples shall be taken a quarter-width from a side edge.a) The longitudinal axes of tensile test piece shall be perpendicular to the direc-tion of rolling.
b) The longitudinal axes of impact test piece shall always be parallel to the direc-tion of rolling.
6.3.2 Sections, girders and wide flats of width less than 600 mm The longi· tudinal axes of the test pieces shall be parallel to the direction of rolling. However, if agreed, transverse test piece may be used for widths between 450 mm and 600 mm. For sections, the test samples shall be taken such that the axis of the test piece is 113 from the outer edge of the half· flange (refer to Hand U sections, ISO 6929) or of the flange (for other sections) or, for the small sections, as near as possible to this position (refer to annex A figure A.l). For the tapered-flange, sections, the test samples may be taken at the outer 1/4 position of the web.
6.3.3 Rounds, squares, flat bars, hexagons and other similar products The longitudinal axes of test pieces shall be parallel to the direction of rolling.
For small sizes, the product itself shall be taken as a test piece.
In other cases, the test piece shall be taken the axis of the test piece so as to be the following position.
for squares and flat bars, at 1/6 of the width (from the outer face) or of the di-agonal.
for rounds and hexagons, at 1/6 from the outside of the diagonal or the diameter (refer to annex A figure A.I).
6.4 Test methods-Types of test pieces
6.4.1 Tensile test (refer to ISO 6892) Normally, the test piece used shall be plate type or rod type of proportional shape and have an original gauge length Lo given by the formula,
Lo
=
5.65,fS;where So is the cross·sectional area of the gauge length of the test piece
The test piece of plate type with rectangular cross·section shall have a maximum width on the gauge length portion of 40 mm, and its thickness shall be that of the product: however, if the product thickness exceeds 30 mm, it may be reduced to 30 mm by planing or milling on one face only.
22
G 3106: 2004
A test piece of rod type may be used for products more than 40 mm thick; it shall be 10 mm to 30 mm in diameter and its original gauge length shall be determined by the above formula; the axis of the test piece shall be positioned at 1/4 of the thickness of the product.
A non-proportional test piece with a fixed initial gauge length may be used. In this case, reference shall be made to a conversion table (refer to ISO 2566-1),
However, in case of dispute, only the results obtained on a proportional test piece shall be taken into consideration.
The yield stress specified in annex 2 table 3 of this Standard is the upper yield stress Re H, if the yield phenomenon is not visible, either the 0.2 % proof stress (RpO.2)
or the 0.5 % proof stress (total elongation) (Rto.5) may be used. The specification of the material is complied with in this respect if one or other of these values satisfies the specified yield stress value.
6.4.2 Impact test
a) The impact test shall normally be carried out on products having a thickness more than 12 mm or diameter more than 16 mm. The test piece shall be machined so that the face nearest to the rolled surface is not more than 1 mm from it.
For products of thickness greater than 40 mm, the test piece shall be taken in such a way that its axis is positioned at 114 of the thickness from the surface.
The notch shall be perpendicular to the rolled surface. If agreed at the time of ordering, impact tests may be carried out on products having a thickness less than 12 mm: the dimensions of the test pieces shall be in accordance with the requirements of ISO 148, i.e. 10 mm x 7.5 mm and 10 mm x 5 mm, or shall cor-respond to 10 x e (e: being the product thickness). The specified energy values are given in annex B.
b) The test shall be carried out using a V-notch test piece supported at both ends (refer to ISO 148), the value to be taken into account being the average of the results obtained from three test pieces cut adjacent to each other from the same product, unless there are reasons for a retest (refer to 6.4.5).
6.4.3 Chemical analysis
a) If a products analysis is specified on the order, the number of samples to be taken shall be in accordance with agreement between the purchaser and the supplier.
The samples may be taken from the test pieces used to check the mechanical properties or from the full thickness of the product at the same place as the test pieces. In case of dispute, only the analysis of material from the full thick
-ness of the product shall be taken into consideration.
For the selection and preparation of samples for chemical analysis, the re-quirements of ~~.Q
..
~~.~~.~ shall be applied.b) In case of dispute, the method used for chemical analysis shall be in accordance with the requirements specified in the corresponding International Standard.
If an International Standard does not exist, the method to be used shan be agreed between the parties concerned.
G 3106: 2004
6.4.4 Faulty test and defective test pieces When a test does not give the re· quired results because of an error in carrying out the test, it shall be cancelled. Error in carrying out the test means incorrect machining, incorrect mounting in the test-ing machine, malfunction of this machine or any other anomaly independent of the metal itself.
If a defective test piece gives satisfactory results, the batch shall be accepted but the corresponding item (from which the test sample was taken) may be subjected to an individual examination for soundness.
6.4.5 Retests If during inspection, a test does not give the required results, addi-tional tests, unless otherwise agreed, may be carried out as follows:
a) Tensile test Procedures defined in 8.3.4.3.2 "Non-sequential tests" of ISO 404 : 1992 shall apply.
b) Impact test The assessment of impact test results shall be made following a sequential method as described in 8.4.3.2 of ISO 404 : 1992 and if retests are necessary, they shall be carried out according to 8.3.4.3.3 of ISO 404.
6.5 Inspection documents The type of inspection documents required shall be chosen among those defined in ISO 10474 and specified in the order.
In any case, this inspection document shall state the manufacturer's results for the ladle analysis of all chemical elements specified for the steel grade concerned.
7 Sorting and reprocessing The requirements of clause 9 of ISO 404 : 1992 shall apply.
8 Non-destructive tests If the purchaser requires non-destructive tests to check the soundness of the products by means of ultrasonic, magnetic or liquid penetrant examination methods, these tests shall be agreed upon at the time of enquiry and order. This agreement shall include details of the test methods and interpretation of results.
9 Marking Unless otherwise agreed at the time of ordering, products other than those of E 185 shall be legibly marked with the followings.
a) the identification symbols for the grade and quality of the steel; b) brand of the manufacturer;
c) if necessary, symbols, letters or numbers which allow the inspection document, test samples and products to be identified.
In the case of products of small unit mass which are consigned in bundles, the above information may be marked on a tag securely attached to each bundle (or it may be marked on the upper plate).
10 Order The order shall specify.
if a particular steel making process is required (4.1)
if the purchaser wishes to be informed of the steel making process (the choice of process being left to the manufacturer) (4.1)
24
G 3106: 2004
if a particular delivery condition is required (4.2) the type of quality D required (4.2.2)
if repair by welding is not permitted [4.3.3 b)]
if product analysis is required (5.1.2) and the number of samples required [6.4.3 a)] if impact tests for quality B are required (6.1)
if impact tests for each rolled product are required for quality D [6.2.4 b)]
if impact tests for products less than 12 mm thick are required [6.4.2 a)l if retests are not permitted (6.4.5)
the type of inspection document required (6.5)
if non-destructive tests are required (8) if other types of marking are required (9)
Points that are not specified shall not be taken into account by the manufacture
Annex A (normative)
G 3106: 2004
Position and orientation of test pieces
Introduction This annex is the Japanese Industrial Standard prepared based on
ISO 630 Structural steels-Plates, wide flats, bars, sections and profiles published
in 1995 as the second edition without modifying its technical content.
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1/3 2/3 1 1/3-l-
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113 213 1/3I
i
213 113 213,
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Remarks: Refer to 6.4.2 [for the impact test, see also 6.4.2 a)].
26
G 3106: 2004
Annex B (normative)
Energy values for impact test pieces of reduced size
Introduction This annex is the Japanese Industrial Standard prepared based on
annex B (normative) to ISO 630 Structural steels-Plates, wide flats, bars, sections
and profiles published in 1995 as the second edition without modifying its technical content.
•
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27 26 25 24 19 18 17 16 15 14 13/
V
/
/
V
5 6/
/
V
/
/
V
/
/
/
7 8 9 10Width of test piece, mm
Annex B Figure B.1 Minimum impact energy values for test pieces
with a width between 5 mm and 10 mm
Annex C (informative)
G 3106: 2004
List of International Standards on tolerances for steel products
Introduction This annex is the Japanese Industrial Standard prepared based on
ISO 630 Structural steels-Plates, wide flats, bars, sections and profiles published in 1995 as the second edition without modifying its technical content.
This annex shall not a parts of this Standard, provided only a supplement for the
items related to the provision of the body of this Standard.
ISO 657-5: 1976 Hot-rolled steel sections-Part 5: Equal-leg angles and unequal·
leg angles-Tolerances for metric and inch series
ISO 657-13: 1981 Hot-rolled steel sections-Part 13: Tolerances on sloping flange beam, column and channel sections
Information: ISO 657-13 : 1981 was withdrawn in 2002.
ISO 657-18: 1980 Hot-rolled steel sections- Part 18: L sections for shipbuilding
{metric series)-Dimensions, sectional properties and tolerances
ISO 657-19: 1980 Hot-rolled steel sections-Part 19: Bulb fats (metric series)-Dimensions, sectional properties and tolerances
ISO 1035-4 : 1982 Hot-rolled steel bars-Part 4 : Tolerances
ISO 7452: 1984 Hot-rolled structural steel plates- Tolerances on dimensions and shape
28
G 3106: 2004
Annex D (informative)
Notes on weld ability
Introduction This annex is the Japanese Industrial Standard prepared based on
annex D to ISO 630 Structural steels-Plates, wide fiats, bars, sections and profiles published in 1995 as the second edition without modifying its technical content.
This annex shall not a parts of this Standard. provided only a supplement for the items related to the provision of the body of this Standard.
The steels specified in this annex do not have unlimited suitability for the vari·
QUS welding processes, since the behaviour of a steel during and after welding
de-pends not only on the material but also on the dimensions and shape, as well as on the manufacture and service conditions of the components.
There is no information concerning the weldability of the grade E 185 and quality A available, as no requirements are specified concerning the chemical composition or in a satisfactory way in terms of weldability.
Steels of qualities B, C and D are generally suitable for all welding processes.
The weldability increases from quality B to D. For grade E 235 B, killed steels (NE or GF) are preferable to steels without specified deoxidation, particularly if
seg-regation zones could be encountered during welding.
With increasing product thickness and increasing strength level, the main risk is the occurrence of cold cracking in the welded zone.
Cold cracking is caused by a combination of the following factors:
the amount of diffusible hydrogen in the weld metal;
a brittle structure of the heat-affected zone;
a significant concentration of tensile stress in the welded joint.
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Comparison table between JIS and corresponding International Standard
JIS G 3106: 2004 RolLed steels for welckd structure ISO 6S0: 1995 StructuraL steels-Plates, wide /lats. bars. 1rections and profiles
(I) Requirements in JIS (11) Inter- (III) Requirements in International (lV) Classification and details of (V) Justification for national Standard technical deviation between JIS the technical deviation Standard and the International Standard and rut-ure measures
number by clause
Location of deviation: annex Indication method: dotted
underlines
Clause Content Clause Content Classifi- Detail of technical
cation by deviation clause
1 Scope ISO 630 1 Scope MODI JIS does not include Bars are specified in
Steel plate, steel st.rip in coil, Steel plates, wide slrip in deletion bars. other JIS which can
section and flat coils, wide floLa, bars, sec- be applied ss needed.
tion snd profiles
2 Normative references 2 Normative references MODI Some JIS have no International
Stan-JIS G 0404, JIS G 0415, ISO 148-1, ISO 377 and alteration corresponding Inter- dards will be cited
JIS G 0416 and others others national Standards. after the harmoniza
-tion of cited. standards. 3 Grade and designation 5 Characteristics of grades NEQ Designation of grade
and qualities is determined based
SM400A, B, C E185 on the tensile strength
SM490A, B, C E235 in JIS and on the
SM490YA, VB E275 yield point in ISO.
SM520C E355
SM570
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(I) Requirements in JIS
Clause Content
4 Chemical composition
Five elements (e, Si, Mo, P, S) are specified. Alloying
cle-meots may be added as
neces-sary.
5 Carbon equivalent or chemical composition on sensitivity of
welding crack 6 Mechanical property
6.1 Yield point or proof stress, tensile strength and elongation
6.2 Charpy absorption energy
B grade: 0
°c,
27 J min.C grade: 0
°c,
47 J min.SM570: -SoC, 47 J min.
7 7 Shape, dimension, mass and the tolerance thereof
JIS G 3192, JIS G 3193 and
JIS G 3194 are cited.
- - - - -_ .. _ - -- . __ .
(II) Inter- (III) Requirements in International
national Standard Standard number Clause Content 5 Characteristics of grades and qualities
Five elements (C, Si, Mo, P,
S) arc specified. Grades are also provided to which
ele-ments which produce a fine-grained structure are added.
6 Inspection and testing 6.2.4 Tensile test
Yield stress, tensile strength and elongation are specified.
6.4.2 Impact test
Test temperature:
-20,0,+20
27 J min.
- -- _ ..
_--(IV) Classification and details of technical deviation between JIS
and the International Standard
by clause
Location of deviation: annex
Indication method: dotted underlines
Classifi- Detail of technical cation by deviation
clause
NEQ ISO's specification is less strict especially in
P and S.
NEQ Not specified in ISO.
-NEQ JIS and ISO differ in the balance of yield
point and tensile
strength (difference of design concept).
MODI JIS and ISO differ in alteration the specified values of
temperature and
energy.
NEQ No items in ISO.
(V) Justification for the technical deviation
and future measures
We will propose the
value of JIS.
We will propose to
specify them.
We will propose the grade of JIS to ISO.
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Clause Content. 8 Appearance Appearances in JIS G 3192,JIS G 3193 and JIS G 3194
are cited.
9 Heat treatment and symbol
Normalizing, quench-hardening and tempering, tempering and thermomechanical control are
spedfied.
10 Tcsts
10.1 Chemical analysis
Clause 8 of JIB G 0404 is cited.
For analytical methods,
methods of each JIB are cited.
10.2 Analytical method
Clause 9 of JIB G 0404 is cited.
In case of over 50 t, 2 pieces.
For the sampling position of test pieces, JIB G 0416 is cited.
national Standard Standard number Clause Content 4.3 Surface appearance-Defects ISO 7788 is cited.
4.2 Delivery condition
As-rolled condition. Other conditions shall Ix! agreed upon.
Symbols arc not specified.
6.4.3 Chemical analysis
In case the corresponding
International Standard
does not exist, the method
w be used shall be agreed between the purchaser and the supplier.
6.2 Test unit
50 t or part thereof Annex Sampling position of test A pieces
technical deviation between JIS the technical deviation
and the International Standard and future measures
by clause
Location of deviation: annex Indication method: dotted
underlines
Classifi- Detail of technical cation by deviation
clause
NEQ JIS and ISO differ in We will harmonize the the cited standards. cited standards.
NEQ [SO has no specifica-tion of symbols.
MODI JIB cites JIB for the We will harmonize the alteration analytical method. analytical methods of
JIB to ISO.
NEQ JIB and ISO differ in We will propose JIB. the test number when
the test lot exceeds 100 t.
"
Sampling position of
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(I) Requirements in JIS Clause Content 11 InspectionFor general matters and reinspection, JIS G 0404 is cited.
12 Marking
s) Symbol of grade
b) Heat number of inspection
number
c) Dimension
d) Quantity or mass of each bundle e) Manufacturer's name or identifying brand 13 Report JIS G 0404 and JIS G 0415 are cited.
Annex (normative) Sampling position 1 of the test piece
Annex (normative) Structural steels-2 Plates, wide flats, bars, section
and profiles
(II) Inter- (II1l Requirements in International national Standard Standard number Clause Content 6.4.5 Retests ISO 404 is cited. 9 Marking
a) Grade snd quality of the steel
b) Brand of the manufac-turer
c) Identification number as needed
6.5 Inspection documents
ISO 10474 is cited.
Annex Position snd orientation of
A test pieces
",,'
(normative) Structural Bteels-Plates, wide flats. bars, section and profiles(IV) Classification and details of
technical deviation between JI8 and the International Standard
by clause
Location of deviation: annex
Indication method: dolted
underlines
Classifi- Detail of technical cation by deviation
clause IDT
MODI JIS has more speci-addition fied items than [SO.
MODI JIS has more detailed
alteration contents than ISO.
NEQ JIS is specified with
the applicable date and will be harmo-nized to ISO in future. IDT
(V) Justification for the technical deviation
snd future measures We will propose JIS. We will propose JIS. Q'" " , ' " ~ o
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national Standard technical deviation between JIS the technical deviation
Standard and the International Standard and future measures
number by clause
Location of deviation: annex
Indication method: doLled underlines
Clause Content Clause Content Clsssifi- Detail of technical
cation by deviation clause
Annex (normative) Position and Annex (normative) Position and lOT
A orientation of test pieces A orientation of test pieces
Annex (normative) Energy vulues for Annex (normative) Energy valucs lOT
B impact test pieces of reduced B for impact test pieces of
size reduced size
Annex (informative) List of Interns- Annex (informative) List. of Inter- lOT
C tional Standards on tolerances C national Standards on 1ol
er-for steel products ances for steel products
Annex (informat.ive) Notes on weld- Annex (informative) Notes on lOT
D abilit.y D weldability
I
Designated degree of correspondence between JIS and International Standard: MOD- - - - ---- . _ - - -
_I
Remarks 1 Symbols in sub-columns of classification by clause in the above table indicate as follows:
IDT: Identical in technical contents.
MOD/deletion: Deletes specification item(s) or content(s) of International Standard.
MOD/addition: Adds specification item(s) or content(s) not included in International Standard. MOD/alteration: Alters the specification content(s) included in International Standard.
NEQ: Not equivalent.
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